Method and apparatus for transmitting control information in wireless communication system

A communication apparatus for use in a wireless communication system, comprising:

• a radio frequency (RF) unit;
• and
• a processor,
• wherein the processor is configured to determine a resource block (RB) pair set for a localized mapping, the RB pair set being a subset of a bandwidth and divided into a control channel element set on which downlink control channel candidates are defined and to monitor the downlink control channel candidates on the control channel element set of the RB pair set in a subframe to detect a downlink control channel allocated to the communication device,
• wherein the downlink control channel candidates includes nth and n+1th downlink control channel candidates of an aggregation level,
• wherein the nth and n+1th downlink control channel candidates of the aggregation level are separated by a gap on the control channel element set, and
• wherein gap size depends on a number of control channel elements in an RB pair of the RB pair set.